Hammer-drill.



A." H. TAYLOR.'

` HAMMER DRILL. AIPLIUATIOH 'FILED TBB. 19, 1909.

' -Patentd Nov. 15, 1910.

r l Zum ALBERT Arr`.-}runr1.on, or Ens'ron, PENNSYLVANIA,

i the drill steel.

i non, Fig. 2 is and i Uma-E1; snnrns manjar onirica.

` QOMPANY, oF NEW Easton, in the county `of Northampton and State of Pennsylvania, have invented new and useful Improvements in HammervDrills, of. which the following is a specilicatlon. A

Thls invention relates to improvements in hammer drills and has for its object to provide certain improvements intheconstruc-A t1on, form and arrangement of the-several parts at the front end of the drill-wherebythe lealmge, of the ressure fluid around the drill steel within t e front head is prevent-I ed thus insuring a'constant supply ofthe pressure iuid to the cutting faces through 2 ln the accompanyingdrawings, represents in side elevation the front end of a hammer drill embodying this invena longitudinal central section through the same, taken in the plane of the line A-A of Fig, 1, Fig. 3 is a front end view of the drill, the drill steel being shown in section, Fig. 4, is a transverse section taken in the plane of the line B--BV of Fig. 2, Fig. 5 is a transverse section taken in the plane of the' line C--C of Fig. 2, Fig. 6 is a detail view in perspective of th elastic washer which forms the fluid-tight packing for thedrill steel within the front head, Fig. 7 is fa detail longitudinal central section through the drill in a plane at right angles to Fig. 2. l v

The hammer cylinder is denoted by 1 and lts anvil lbliockby 2. The front head 3 which forlns the drill to the front end of the'hammer cylinder as,

forfinstance, by'beingscrewed thereon, and it is locked in position by a clamping ring 4,Av This front head is provided with a reduced bore 5, intermediate inner and outer enlarged bores 6 and 7 through which reduced bore the shank of the hollow drill steel l,8 is inserted into osition to have its' end engaged by theanvll block 2. This reduced.; bore 5 in thefront head is made to conform to the cross sectional shape of the drill steel. u

A cup Washer 9 is located around the head 0f theA packing to working bac into the hammer cylinder. A

Speolcstion of Letters Patent. s -Ap'plicatin mea February 19, 190e. semi No. 478,795.

,pressure Huid chamber 10 Figure 1v are interlocked, as, for instance ing the elastic Washer With a flattened lug-85 steel holder is secured anvil block 2 to form a fluid-tightl b revent the pressure fluid from ASSIGNOR T0 INGERSOLL-RAND vom; N. Y., A conroenmzon or Nnwaeasnr.

' HAMMER-DRILL.

Patented Nov. 15, 1910.

head of the anvil block 2.

. The bore 11 oflthe hollow drill steel 8 is 1n open communication at all times with this chamber 10 through a duct 12 in the head of the anvil block,D the longitudinal A branch of which duct is 1n alinement with the bore A11 in the drill -steel and the transverse branchV of which duct opens into the chamber 10.

A pressure to a hole 14 1n theside wall of the front head in communicationfwith the chamber 10.

An elastic washer 15,' referably of rubber, is inserted within `t e outer enlarged bore 7 of the front head,the bore. of which 70 washer conforms to the cross sectional shape of the drill steel8.

A bushing 16 is located in front of the elastic washer 15, which bushing is locked' against rotary movement with respect to the front head but permitted a longitudinal movement with respect thereto, for instance, by providing the outer end of the front head with open ended slots 17, 18, and the bushing 16 with lugs cross sectional shape of'the drill steel 8.

. Tlie'elastic washer 15 and the bushing. 16

21 on its outer face and the bushin recess 22 in its inner face for lug.

A. nut 23 has a-screw threaded engagement with a receiving said with the outer end of the front head 3 and 90 also engages the bushing 16. This nut is yieldingly held in any of its rotatively adjustable positions as,.for instance, by providing lts inner end with an interior annular series of ratchet teeth 24C arranged to be 95 engaged by a spring pressed pawl 25 seated in the front he d. v i g' The spring` which forces the pawl into engagement with the teeth 24 is. denoted by 26 and the pawl is limited as to itsoutward 160 movement by a circumferential' band spring \27 so as to permit the removal of the nut without displacement of the In operation, suiiicie'ntly to ushing 16 on the elastic washer 15. The drill steel is then inserted into its position through the bushing 16, the washer -15 and pawl. the nut 23 is first unscrewed surrounds -the 55 liuid supply pipe is secured 65 19, 20 entering said slots. 80 The bore of the bushing 16 conforms to the by providremove the pressure of the Vt1 small bore 5 of the front head. I The nut It will be seen that the elastic Washer absolutely prevents the leakage oli' the pressure fluid as itis being fed to the drill steel. When it is desired to remove the drill steel, the nut 23 is uuscrewed sufficiently tocause the bushing to remove its pressure from the elastic washer 15 and Vthus free the drill steel from the grip of the elastic washer.

The pawl and ratchet, connection between l the front head and nut serves to prevent the vibrations of the drill from causing the nut to unscrew.

The packing shown and described but not claimed herein forms the subject matter of applicants copending application filed June 5, 1909, Serial No. 500,279.

That I claim is z- 1. In a hammer drill, a front head having outer and inner enlarged bores andan intermediate reduced bore, an anvil block having its head located in the inner enlarged bore, a drill steel fitted to the intermediate reduced bore, au elastic washer located in the outei-`ei1larged bore and means for causing the washer to grip and release the steel.

2. In a hammer drill, a fronthead havl ing outer and inner enlarged bores and an Y intermediate reducedbore, an anvil block having its head located in the inner enlarged trasera;`

bore, 'and provided with ahpressure fluid passage, said front head having apressure fluid chamber therein lsurrounding the anvil block', 'a hollow drill steel fitted to said intermediate reduced bore and in open com munication With the pressure fluid feeding chamber through the passage in the said anouter bore and means for causing the Washer to grip the steel to prevent the leakage of pressure fluid around the steel.

3. In a hammer drill, a front head having outer and inner enlarged bores and an intermediate reduced bore, `an anvil block having its head located in the inner enlarged bore,

and provided with a pressure fluid passage,v

said Vfront .head having a pressure fluid chamber therein surrounding the anVll block, afhollow drill steel fitted to said intermediate reduced bore and inV open communication With the pressure liuid feeding chamber through the passage in the said anvil block, an elastic Washer in said. enlarged outer bore, means for causing the washer to grip the steel to prevent the leakage of pressure fluid around the steel, and aI Washer surrounding the head of the anvil block for preventing the leakage of the pressure liuid to the hammer cylinder. y

In testimony, that I claim the 'foregoing' as my invention, I have signed my name in presence of two Witnesses, this 17th dayv of February, 1909.

ALBERT H. TAYLOR. lVitnesses i' RUSSELL I-I. WILHELM, CHAS. B. BRUNNER.

. 45 vil block, an elastic Washer in said enlarged v 

